Baltimore Orioles outfielder Trey Mancini announced Tuesday morning that he has Stage 3 colon cancer.He's to undergo six months of chemotherapy treatment.Mancini, 28, made the announcement in a letter titled "I Am So Lucky" on The Players' Tribune website.Mancini opened up with an emotional account of his cancer discovery, the support he has received and how his love for baseball has grown even stronger. Mancini said he was feeling off during spring training in Florida and initially chalked it up to "getting older." He went to the hospital for blood work, and celiac disease or a stomach ulcer were the suspected culprits, he said."When I went in for an endoscopy and colonoscopy, the doctors told me that they were really expecting to confirm that I had celiac disease, which is found in your small intestine. When the anesthesia put me under, I believed everything was going to be OK," Mancini wrote.Mancini said he woke up from anesthesia with his girlfriend holding his hand. The doctor told him he had cancer."He started by eliminating all the possible things it could have been. I was still woozy from the anesthesia, but before he even said the word cancer, I was thinking to myself, 'There's no way that he's about to say what I think he's about to say.' And then he said it: They had found a malignant tumor in my colon," Mancini wrote.Mancini was diagnosed with Stage 3 colon cancer and started chemotherapy on April 13.Mancini said his father was diagnosed with Stage 2 colon cancer in 2011 at the age of 58.The Orioles player goes on to explain how lucky he has been in his career, and thanked the organization and his fans, like teenager Mo Gaba, who has been fighting cancer since he was 9 months old.Mancini singled Mo out in the article as an inspiration."The 13-year-old kid with cancer calling me to make sure I'm OK? It blew me away. I told Mo I was going to be fine, and then I told him we'd hang out again soon. That's a promise I fully intend to keep," Mancini wrote.Mo's infectious enthusiasm remains unstoppable."Stay strong, Trey, you'll be fine," Mo said on a video call with 11 News.So, Mancini and Mo now have more in common than a love for baseball. Mo has his own battles with cancer and offers some advice for Mancini: "Just stay positive. That's all you can really do. Just stay positive. That's an outlook a lot of us can use right now, to get through the pandemic."From the moment Mancini arrived in Baltimore, he has wanted to make a difference in the community. And even as he fights cancer, his thoughts remain there."If baseball returns in 2020, it will probably be without me," Mancini wrote. "After my chemo is done, and when I'm totally cancer free, I've got a few different ideas of what I can do. I'm lucky enough to have a platform that I feel allows me to make a difference for some people."Click here to read more.

Mancini, 28, made the announcement in a letter titled "I Am So Lucky" on The Players' Tribune website.

Mancini opened up with an emotional account of his cancer discovery, the support he has received and how his love for baseball has grown even stronger.

Mancini said he was feeling off during spring training in Florida and initially chalked it up to "getting older." He went to the hospital for blood work, and celiac disease or a stomach ulcer were the suspected culprits, he said.

"When I went in for an endoscopy and colonoscopy, the doctors told me that they were really expecting to confirm that I had celiac disease, which is found in your small intestine. When the anesthesia put me under, I believed everything was going to be OK," Mancini wrote.

Mancini said he woke up from anesthesia with his girlfriend holding his hand. The doctor told him he had cancer.

"He started by eliminating all the possible things it could have been. I was still woozy from the anesthesia, but before he even said the word cancer, I was thinking to myself, 'There's no way that he's about to say what I think he's about to say.' And then he said it: They had found a malignant tumor in my colon," Mancini wrote.

Mancini was diagnosed with Stage 3 colon cancer and started chemotherapy on April 13.

Mancini said his father was diagnosed with Stage 2 colon cancer in 2011 at the age of 58.

The Orioles player goes on to explain how lucky he has been in his career, and thanked the organization and his fans, like teenager Mo Gaba, who has been fighting cancer since he was 9 months old.

Mancini singled Mo out in the article as an inspiration.

"The 13-year-old kid with cancer calling me to make sure I'm OK? It blew me away. I told Mo I was going to be fine, and then I told him we'd hang out again soon. That's a promise I fully intend to keep," Mancini wrote.

Mo's infectious enthusiasm remains unstoppable.

"Stay strong, Trey, you'll be fine," Mo said on a video call with 11 News.

So, Mancini and Mo now have more in common than a love for baseball. Mo has his own battles with cancer and offers some advice for Mancini: "Just stay positive. That's all you can really do. Just stay positive. That's an outlook a lot of us can use right now, to get through the pandemic."

From the moment Mancini arrived in Baltimore, he has wanted to make a difference in the community. And even as he fights cancer, his thoughts remain there.

"If baseball returns in 2020, it will probably be without me," Mancini wrote. "After my chemo is done, and when I'm totally cancer free, I've got a few different ideas of what I can do. I'm lucky enough to have a platform that I feel allows me to make a difference for some people."